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diff --git a/include/grgsm/trx/freq_hopper_msg.h b/include/grgsm/trx/freq_hopper_msg.h
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+++ b/include/grgsm/trx/freq_hopper_msg.h
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+/* -*- c++ -*- */
+/* @file
+ * @author Piotr Krysik <ptrkrysik@gmail.com>
+ * @section LICENSE
+ * 
+ * Gr-gsm is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * Gr-gsm is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with gr-gsm; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ * 
+ */
+
+
+#ifndef INCLUDED_GSM_FREQ_HOPPER_MSG_H
+#define INCLUDED_GSM_FREQ_HOPPER_MSG_H
+
+#include <grgsm/api.h>
+#include <gnuradio/sync_block.h>
+
+namespace gr {
+  namespace gsm {
+
+    /*!
+     * \brief <+description of block+>
+     * \ingroup gsm
+     *
+     */
+    class GRGSM_API freq_hopper_msg : virtual public sync_block
+    {
+     public:
+      typedef boost::shared_ptr<freq_hopper_msg> sptr;
+
+      static sptr make(
+        double samp_rate = 1e6,
+        double start_fc_rx = 1e9,
+        double start_fc_tx = 1e9,
+        bool rx_hopping=true,
+        bool tx_hopping=true,
+        double freq_change_period=0.0046);
+
+      /*!
+       * hopping_cmd is a pmt dictionary with following fields:
+       * "cmd": string with type of command, possible values:
+       *     -"start" - immediately start hopping or if there is "fn" 
+       *                field defined start from frame number defined 
+       *                by that field
+       *     -"stop"  - immediately stop hopping or if there is "fn" 
+       *                field defined start from frame number defined 
+       *                by that field
+       *     -"discard" - discard all queued "start_fn" and "stop_fn" 
+       *                (this command doesn't require hopping parameters or frame number)
+       * "hopping_params": dictionary with hopping parameters in following form:
+       *     {"hsn": hopping_sequence_number(uint64),
+       *      "ma":   mobile_allocation(list of arfcns),
+       *      "maio": mobile_allocation_index_offset(uint64),
+       *      "n_arfcn": number_of_arfcns_in_ma}
+       *  "fn": frame number when to start or stop hopping
+       */
+//      virtual void add_hopping_cmd(pmt::pmt_t hopping_cmd=pmt::PMT_NIL) = 0;
+    };
+  } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_FREQ_HOPPER_MSG_H */